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Originally Posted by Ewout_vB
What temps are these memory chips rated for?
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Ta of 65-70 C. Tj of 110C
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Because 80C in my opinion is a bit higher - maybe not thermally stressed - but I'll feel better knowing they aren't so close to their thermal maximum.
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Your are comparing the aborted DDR2 to DDR3 in which there are significant power differentials. In addition, the cause of the temp on even the DDR2 chips has more to do with local board Ta self heating than with the power of the dram devices themselves. Once the majority of the heat is being removed through water cooling, the local board heating will reduce significantly, which will directly drop the tempature of the dram devices.